High power-double strapped vane type magnetron

Abstract

A magnetron comprising a large vane-type, double-strapped anode structure with the vanes being cooled by liquid flowing in a channel immediately behind the surface bombarded by electrodes and the two pairs of straps passing through openings in the vanes, a liquid cooled secondary-emission cathode positioned centrally of the anode, said cathode incorporating a starting filament connected to a heating current power source, means for engendering an axial magnetic field in the region between anode and cathode, and power output means connected to at least one slot between vanes, said means including a coupling slot, a ridge waveguide transition connected to said slot and a window between the transition and an output waveguide.

I claim: 
     
       1. A high power double-strapped, vane-type magnetron comprising: a. an evacuated housing,   b. an anode structure mounted in the housing and formed of an even number of vanes defining resonant cavities there-between and at least one pair of circumferential straps passing through openings in the vanes with the straps connected in interleaved relation to alternate vanes, said vanes having cooling channels therein directly behind the anode surface to be bombarded by electrons,   c. a cathode structure mounted centrally of said anode, said cathode structure comprising a secondary emission cathode surface and a separate starting filament mounted thereon,   d. a coupling slot connecting one of said resonant cavities via a ridged waveguide transition and a window to an output waveguide, and   e. means for applying an axial magnetic field in the region between the anode and cathode.   
     
     
       2. A magnetron as in claim 1 wherein the number of vanes is 12 and there are two pairs of straps.